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db/simple/Directory: reimplement LookupDirectory() without allocations 

Use std::string_view to avoid modifying the string for the temporary
null terminators.
This commit is contained in:
Max Kellermann 2020-04-02 19:26:12 +02:00
parent 6593b5998a
commit dadf054fbb
1 changed files with 13 additions and 25 deletions
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38
src/db/plugins/simple/Directory.cxx
View File

@ -30,9 +30,9 @@
#include "song/Filter.hxx"
#include "lib/icu/Collate.hxx"
#include "fs/Traits.hxx"
#include "util/Alloc.hxx"
#include "util/DeleteDisposer.hxx"
#include "util/StringCompare.hxx"
#include "util/StringView.hxx"
#include <cassert>
@ -127,24 +127,24 @@ Directory::PruneEmpty() noexcept
}
Directory::LookupResult
Directory::LookupDirectory(const char *uri) noexcept
Directory::LookupDirectory(const char *_uri) noexcept
{
assert(holding_db_lock());
assert(uri != nullptr);
assert(_uri != nullptr);
if (isRootDirectory(uri))
if (isRootDirectory(_uri))
return { this, nullptr };
char *duplicated = xstrdup(uri), *name = duplicated;
StringView uri(_uri);
Directory *d = this;
while (true) {
char *slash = strchr(name, '/');
if (slash == name)
do {
auto s = uri.Split(PathTraitsUTF8::SEPARATOR);
if (s.first.empty())
break;
if (slash != nullptr)
*slash = '\0';
const auto name = s.first;
const auto rest = s.second;
Directory *tmp = d->FindChild(name);
if (tmp == nullptr)
@ -153,22 +153,10 @@ Directory::LookupDirectory(const char *uri) noexcept
d = tmp;
if (slash == nullptr) {
/* found everything */
name = nullptr;
break;
}
uri = rest;
} while (uri != nullptr);
name = slash + 1;
}
free(duplicated);
const char *rest = name == nullptr
? nullptr
: uri + (name - duplicated);
return { d, rest };
return { d, uri.data };
}
void